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fs/block_dev.c: __read_mostly improvement and sb_is_blkdev_sb utilization

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- iget5_locked in bdget really needs blockdev_superblock, instead of
  bd_mnt, so bd_mnt could be just a local variable;

- blockdev_superblock really needs __read_mostly, while local var bd_mnt
  not;

- make use of sb_is_blkdev_sb in bd_forget, instead of direct reference
  to blockdev_superblock.

Signed-off-by: Denis ChengRq <crquan@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Denis ChengRq 2008-12-01 14:34:56 -08:00 committed by Al Viro
parent 6badd79bd0
commit c2acf7b908
1 changed files with 5 additions and 4 deletions
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9
fs/block_dev.c
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@ -326,12 +326,13 @@ static struct file_system_type bd_type = {
.kill_sb = kill_anon_super,
};
static struct vfsmount *bd_mnt __read_mostly;
struct super_block *blockdev_superblock;
struct super_block *blockdev_superblock __read_mostly;
void __init bdev_cache_init(void)
{
int err;
struct vfsmount *bd_mnt;
bdev_cachep = kmem_cache_create("bdev_cache", sizeof(struct bdev_inode),
0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
SLAB_MEM_SPREAD|SLAB_PANIC),
@ -373,7 +374,7 @@ struct block_device *bdget(dev_t dev)
struct block_device *bdev;
struct inode *inode;
inode = iget5_locked(bd_mnt->mnt_sb, hash(dev),
inode = iget5_locked(blockdev_superblock, hash(dev),
bdev_test, bdev_set, &dev);
if (!inode)
@ -463,7 +464,7 @@ void bd_forget(struct inode *inode)
spin_lock(&bdev_lock);
if (inode->i_bdev) {
if (inode->i_sb != blockdev_superblock)
if (!sb_is_blkdev_sb(inode->i_sb))
bdev = inode->i_bdev;
__bd_forget(inode);
}